Dub siren online: test it for free in your browser

Want to hear what a dub siren sounds like before investing in a hardware unit or diving into a VST? Or just have some fun in between mixes? There are a number of dub sirens that can be played directly online, in your browser, without installation. This practical guide explains how to use them, their limitations and when to move on.

To understand how a dub siren works, how to connect it to a delay and which types of units are available, read the guide. On this page, you can get straight to playing in your browser.

Why an online dub siren?

The idea is not to replace a real instrument. The idea is to give you :

• A way of discovering the sound in 30 seconds, without installing anything
• A learning tool: understand how a pitch, LFO or delay reacts
• Live troubleshooting when you don’t have your hardware to hand and a laptop is lying around
• A place for impromptu jams to test out ideas with sound system friends

In short: an entry point and a complement, not a main instrument.

The solutions available

The ecosystem is constantly evolving. Here are the approaches available today.

Dedicated websites

Several enthusiastic developers have put dub siren emulations online in HTML5/Web Audio API, playable by click or keyboard. Most are personal projects, sometimes maintained, sometimes abandoned.

Google “dub siren online”, “dub siren in browser”, “dub siren html5”. You’ll find :

• Minimalist tools: a knob, a pitch knob, a rate knob. Perfect for fun.
• More complete emulations with delay, filter and several voices. Rarer, but they do exist.
• Open source projects hosted on GitHub Pages, whose code you can download.

Caution: before entering the URL of an obscure site, check that it is a well-intentioned project (presence of an “about” page, visible source code if possible). Sites that ask for microphone access or bizarre authorisations for a simple dub siren should be avoided.

Web Audio community patches

Platforms such as WebAudio Playground, Tone.js examples or Glitch.com host dub siren prototypes in JavaScript. You can play them but also see their code and modify them – excellent for understanding how it’s done.

Modular synth web apps

Editors like Audiotool (free, browser-based) let you build your own dub siren from a VCO, an LFO and a delay. More engaging than a simple effects player, but more powerful too.

How to use it effectively

Audio in the browser: what you need to know

The Web Audio API that these tools use is now mature: latency is OK, audio quality is very acceptable for monitor listening. However:

• Depending on your browser, your system and your sound card, you may experience a latency of 10 to 100 ms – noticeable if you play in sync.
• Rendering is in 44.1 kHz / 16 bits by default, which is sufficient for listening, but limited for studio recording.
• Some effects (particularly long delays with high feedback) can saturate the navigator’s internal audio in unpredictable ways

Connect the output to an audio system

If you want to hear your dub siren web on your sound system or DJ headphones:

1. Plug in your external sound card (audio interface)
2. Configure it as the default audio output in the operating system.
3. The browser will automatically send the sound to your card
4. From there, go to your mixer/sound system as normal

Be careful with the level: most web dub sirens come out at a very warm volume. Start your mixer master at the bottom and work your way up.

Record it

To capture a dub siren web sound:

• Internal capture: on a Mac, use BlackHole or Loopback; on Windows, use VoiceMeeter or OBS.
• External capture: if you already send the web output to your sound card, you can reinject it via a physical loop (output → input) and record it in your DAW.

It’s rustic but it works. For serious production, switch to a VST or sample pack – see our article on the best dub siren VSTs.

Playing tips

A web dub siren is played using the same principles as a hardware dub siren. The controls may vary but the idea remains the same:

1. The push-button (often a large on-screen button or the space bar) triggers the siren as long as it is held.
2. The pitch is controlled with a knob or a key on the keyboard – vary it as you play
3. The LFO rate creates the characteristic movement
4. The delay transforms a thump into a dub cascade

Play with the music: trigger the siren on breaks, vary the pitch on the end of the movement, let the delay resolve itself in the silence.

Limits compared to a real instrument

Be clear:

• No analogue soul: it’s pure digital calculation, perfectly clean, and therefore less ‘alive’ than a 555 hardware.
• No stage ergonomics: playing a dub siren with a mouse is feasible, but it breaks the gesture.
• No stage reliability: a crashed website, a dropped connection, a browser update that changes everything – you’re never safe.
• No presets saved locally most of the time

For live sound systems, don’t use a web dub siren as your main tool. For exploring, learning and prototyping an idea, it’s perfect.

Build your own

If you have some JavaScript basics, programming your own web dub siren is an excellent exercise. Structure:

Oscillator (audio) → Gain (trigger) → Delay → Output
       ↑
   LFO (low freq)

The Tone.js library simplifies the work enormously: in 30 lines of code you have a basic, functional dub siren. If you like the idea, the Tone.js documentation has everything you need to get started.

In a nutshell

Online dub sirens are excellent tools for discovery and prototyping, free and instantaneous. Play with them, understand the parameters, choose your sound vocabulary – then when you know where you’re going, move on to pro software(VST) or hardware(NJD, Benidub, RDH). That’s the natural progression.

And if you’re itching to code your own dub siren, take a look at our article on the 555 analogue schematic: understanding the hardware helps enormously in coding a proper emulation.

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